Device for the erection of boardings for the production of cofferwork without the use of scaffolding



. a 1 ME'LZER Y DEV-ICE FOR THE EHECTIONLOF BOARDINGS FOR THE PRODUCTION OF G QEFERWORK WITHOUT- THE USE OF SGAFFOLDING.

Patented Mar. 27, 1923.

ALBERT MELZER, OF OSTHOFEN, GERMANY.

DEVICE FOR THE ERECTION OF BOARDINGS FOR THE PRODUCTION OF GOFFERWORK WITHOUT THE USE OF SCAFFOLDING.

Application filed September 17, 1921. Serial No. 501,480.

T all whom it may concern:

Be it known that I, ALBERT MnLznR, a citizen of the German Republic, residing at Osthofen, Germany, have invented certain 5 new and useful Improvements in Devices for the Erection of Boardings for the Production of Coiferwork without the Use of Scaffolding, of which the following is a specification.

This invention relates to a method and a device for the erection without scaffolding, of boardings for the production of cotter work with the use of one or several pairs of planks maintained in the working posi 5 tion by means of tie bows.

According to known working methods the planks connected by holding bows or other parts of the boarding are filled up to the upper edge with filling material whereupon the material is left to harden, before all the holding bows have been removed, a new boarding is put up by means of the previously used parts of the boarding and of the holding bows. The loss of time and of lahour connected with this known method is avoided by a continuous working method which has been proposed and according to which without regard to the hardening of the rammed in filling material-when two or more pairs of planks are usedanother pair of planks is placed upon the upper planks of the boarding, this new pair of planks being placed above the holding bows extending through the section of the wall to be connected provisionally with the preceding pair of planks by means of holding bows, whereupon, after the holding bows of the pair of planks below the middle boarding have been depressed by, means of the new holding hows, the upper boarding is lowered upon the middle boarding to get ready for work.

Although this latter method forms progress over the old method the pressing down of the upper boarding is diflicult and requires time as the boarding has always to be correctly adjusted.

This invention shows how this inconvenience can be avoided in conserving the continuous erection of the wall.

According to this improved method holding bows are fixed upon the upper pair of planks which enclose the material rammed in whereupon the lower holding bows are removed and the new planks placed directly upon the upper planks, these new planks being held by adjustable holding and straightening bows.

In order that the invention may be clearly understood, I shall proceed to describe the same with reference to the accompanying drawing, wherein Fig- 1 shows in side elevation the boarding and the holding bows.

Fig. 2 is a front elevation view of Fig. 1.

Figs. 3 and 4 illustrate, on smaller scale, the erection of the boarding and the manner in which the holding bows are used.

F or continuously erecting the cotter work, holding bows B are placed upon the boarding a which is already filled with rammed inmaterial, whereupon the holding bows B, which have hitherto held the boarding are loosened and removed together with the pair of planks which has been free. The removed planks are used for making the new boarding. The planks a which remain in place are held in the meantime merely by jaws 0. These jaws c are preferably made from solid wood; they have projections at the lower part which are in contact with the planks a and their upper surfaces are inwardly inclined. The jaws 0 are guided upon profiled irons, for instance T irons (Z, by means of grooves provided in their upper edge. The guiding is effected with the aid of U-shaped iron bows e which are fixed to the jaws c and grip over the guide rails (Z. These bows e have pressure screws f in their web.

When the new boarding is to be put in place, the jaws c which are loosely guided upon the rails (Z (Fig. i) are pressed against the planks a in position and secured in position by the tightening of the screws f. Owing to the tightening of the screws the bows e are displaced in the direction of the arrows 1. The jaws c pivoting around the point 2 are moved with their lower ends in the direction of the arrows 3 towards the planks a so that they are pressed strongly against the same. The planks a of the old boarding can now be placed upon the planks a. As the planks a are held only at the ends, the planks a can be easily inserted obliquely from above. After the insertion of the planks a and after adjusting the distance of said planks according to the thickness of the wall to be erected by means of spacing blocks g, the distance and straightening bars it are placed against the planks a. These bars k are hingedly connected with the aws c by means of hinges i and located in the space left free between the upper part of the aws and the planks.

A toggle joint 7;, adapted to be operated by a lever Z is inserted at the upper part of the jaw 0 between said jaw or the bow e and the straightening bar h. hen the lever Z is depressed in the direction of arrow 4L the toggle joint 70 is straightened in the direction of arrow 5 whereby the straightening bar it, pivoting around the hinge i, is pressed against the plank a in the direction of the arrow 6. The levers Z can be secured in their position in the well known manner by means of stop pins or the like: The new boarding can now be vertically adjusted by loosening or tightening the screws 7'.

The continuous erection of boardings for co-fl'er work can be thus efi'ected with only two or more pairs of planks without the necessity of mounting the planks for the fresh boarding upon the holding bows.

I claim 1. An improved holding clamp for the erection of boarding for coli'cr work without the use of scaflolding, comprising in combination with an upper profiled guide rail, two clamping jaws adjustably guided on the lower surface of said rails, an inwardly directed projection at the lower end of each of said jaws, one U-shaped bow for each jaw fixed at the upper end of said jaw, and gripping over said guide rail, a set screw in the web of each U-shaped bow, one

holdingand straightening bar for each aw hingedly connected at its lower end with the upper surface 01? the inwardly directed projection of said jaw and designed to bear against several boarding planks, a toggle joint between each jaw and the upper part of its straightening bar and a hand. lever for each toggle joint.

2. An improved holdin" clamp for the erection of boarding for cotter work without the use of scafiolding, comprising in combination with an upper profiled guide rail, two clamping jaws adjustably guided on the lower surface of said rails having an inwardly inclined upper surface which is in contact with said guide rail at one point only, an inwardly directed projection at the lower end of each of said jaws, one U-shaped box for each jaw fixed at the inner part of the upper end of said jaw, and gripping over said guide rail, a set screw in the web of each U-shaped how, one holdingand straightening bar for each jaw hingedly connected at its lower end with the upper surface of the inwardly directed projection of said jaw and designed to bear against several boarding planks, a toggle joint between each jaw and the upper part of its straightening bar and a' hand lever for each toggle oint. I

In testimony whereof I affix my signature in presence of two witnesses.

ALBERT MELZER. Witnesses KARL SONER, KARL MoNonn. 

